I bought an OTR i3 — paid for it, too!
And I agree it’s my current favorite.
But I’ll +1 for the ZeusRay — aluminum pill version — for $7 with free shipping.
A bit of a lottery there from time to time (but they sent me a better one when I told them and showed them pictures demonstrating I got a bad one — commendable quick response, no argument), but no bad reports lately. See the consolidated thread: